Kubuntu is a GNU/Linux operating system built by a worldwide team of expert developers. It contains all the applications you need: a web browser, an office suite, media apps, an instant messaging client and many more. It's based on KDE Plasma desktop and KDE software. This is a Long Term Support release.

Kubuntu 13.04 Highlights

KDE Plasma and Applications 4.10

The current update release of KDE's Plasma Workspaces and Applications 4.10 adds a new screen locker, Qt Quick notifications, colour correction in Gwenview and faster indexing in the semantic desktop.

Muon Suite 2

Included is is the new version of the Muon Suite for app install and upgrades. It introduces support for installing Plasma widgets found in KDE's KNewStuff framework from within Software Center and Muon Discover.